Mono- and di-nuclear photoluminescent complexes of zinc(II), cadmium(II) and mercury(II) of a chiral diimine ligand.
作者： Suman Kundu , Suvendu Maity , Pinki Saha Sardar , Sanjib Ghosh , Prasanta Ghosh
DOI: 10.1039/C3DT51348C
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摘要: Reaction of α-pyridoin and N-phenyl-o-phenylenediamine affords 2-(2-(phenylamino)phenylimino)-1,2-di(pyridin-2-yl)ethanol (L) which undergoes cyclization to a chiral diimine, 2-methoxy-1-phenyl-2,3-di(pyridin-2-yl)-1,2-dihydroquinoxaline, L(OMe) (conjugated 14πe system) in the presence zinc(II), cadmium(II) mercury(II) ions affording [Zn(L(OMe))Cl2] (1), [Cd2(L(OMe))2Cl4] (2) [Hg2(L(OMe))2Cl4] (3) complexes. Ligand L complexes 1-3 are substantiated by elemental analyses, mass, IR, (1)H NMR UV-vis spectra including single-crystal X-ray structures 1 3. The possibility atropisomerism is restricted cyclic L(OMe). fluorescent fluid solutions at 298 K (CH2Cl2: 1, λ(ex) = 470 nm, λ(em) 627 Φ 0.014, τ(avg) 2.5 ns; 2, 430 599 0.08, 7.6 3, 415 600 0.021, 2.8 ns). Time-resolved emission (TRES) established that two-component lifetimes due existence two conformers. Density functional theory (DFT) time dependent (TD) DFT calculations authenticated intra-ligand charge transfer (ILCT) π(diimines)* orbital.
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